Do American Shorthair cats have an undercoat?

Yes, American Shorthair cats do have an undercoat. While their outer coat is short and dense, they also have a soft, fluffy undercoat that helps insulate them and keep them warm.

This undercoat is less noticeable than the outer coat, but it's still an important part of their fur. It's also why American Shorthairs are often described as having a "double coat".